The song is the last verse of the Avinu Malkeinu prayer which is recited daily from Rosh Hashanah to Yom Kippur during the Ten Days of Repentance.On Jewish New Year - Rosh Hashanah - it is sung as part of the Shacharit (morning) service.On the Day of Atonement - Yom Kippur - it's recited in the Shacharit (morning) service and at Neila, the closing service. This prayer is omitted if Yom Kippur falls on the Sabbath.